busybox/libbb/xconnect.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Connect to host at port using address resolution from getaddrinfo
 *
 */

#include <netinet/in.h>
#include <net/if.h>
#include "libbb.h"

void FAST_FUNC setsockopt_reuseaddr(int fd)
{
	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
}
int FAST_FUNC setsockopt_broadcast(int fd)
{
	return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
}
int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
{
	int r;
	struct ifreq ifr;
	strncpy(ifr.ifr_name, iface, IFNAMSIZ);
	/* Actually, ifr_name is at offset 0, and in practice
	 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
	 * But just in case it's not true on some obscure arch... */
	r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
	if (r)
		bb_perror_msg("can't bind to interface %s", iface);
	return r;
}


void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
{
	if (connect(s, s_addr, addrlen) < 0) {
		if (ENABLE_FEATURE_CLEAN_UP)
			close(s);
		if (s_addr->sa_family == AF_INET)
			bb_perror_msg_and_die("%s (%s)",
				"cannot connect to remote host",
				inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
		bb_perror_msg_and_die("cannot connect to remote host");
	}
}

/* Return port number for a service.
 * If "port" is a number use it as the port.
 * If "port" is a name it is looked up in /etc/services, if it isnt found return
 * default_port */
unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
{
	unsigned port_nr = default_port;
	if (port) {
		int old_errno;

		/* Since this is a lib function, we're not allowed to reset errno to 0.
		 * Doing so could break an app that is deferring checking of errno. */
		old_errno = errno;
		port_nr = bb_strtou(port, NULL, 10);
		if (errno || port_nr > 65535) {
			struct servent *tserv = getservbyname(port, protocol);
			port_nr = default_port;
			if (tserv)
				port_nr = ntohs(tserv->s_port);
		}
		errno = old_errno;
	}
	return (uint16_t)port_nr;
}


/* "Old" networking API - only IPv4 */

/*
void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
{
	struct hostent *he;

	memset(s_in, 0, sizeof(struct sockaddr_in));
	s_in->sin_family = AF_INET;
	he = xgethostbyname(host);
	memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
}


int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
{
	int s = xsocket(AF_INET, SOCK_STREAM, 0);
	xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
	return s;
}
*/

/* "New" networking API */


int FAST_FUNC get_nport(const struct sockaddr *sa)
{
#if ENABLE_FEATURE_IPV6
	if (sa->sa_family == AF_INET6) {
		return ((struct sockaddr_in6*)sa)->sin6_port;
	}
#endif
	if (sa->sa_family == AF_INET) {
		return ((struct sockaddr_in*)sa)->sin_port;
	}
	/* What? UNIX socket? IPX?? :) */
	return -1;
}

void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
{
#if ENABLE_FEATURE_IPV6
	if (lsa->u.sa.sa_family == AF_INET6) {
		lsa->u.sin6.sin6_port = port;
		return;
	}
#endif
	if (lsa->u.sa.sa_family == AF_INET) {
		lsa->u.sin.sin_port = port;
		return;
	}
	/* What? UNIX socket? IPX?? :) */
}

/* We hijack this constant to mean something else */
/* It doesn't hurt because we will remove this bit anyway */
#define DIE_ON_ERROR AI_CANONNAME

/* host: "1.2.3.4[:port]", "www.google.com[:port]"
 * port: if neither of above specifies port # */
static len_and_sockaddr* str2sockaddr(
		const char *host, int port,
USE_FEATURE_IPV6(sa_family_t af,)
		int ai_flags)
{
	int rc;
	len_and_sockaddr *r = NULL;
	struct addrinfo *result = NULL;
	struct addrinfo *used_res;
	const char *org_host = host; /* only for error msg */
	const char *cp;
	struct addrinfo hint;

	/* Ugly parsing of host:addr */
	if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
		/* Even uglier parsing of [xx]:nn */
		host++;
		cp = strchr(host, ']');
		if (!cp || cp[1] != ':') { /* Malformed: must have [xx]:nn */
			bb_error_msg("bad address '%s'", org_host);
			if (ai_flags & DIE_ON_ERROR)
				xfunc_die();
			return NULL;
		}
	} else {
		cp = strrchr(host, ':');
		if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
			/* There is more than one ':' (e.g. "::1") */
			cp = NULL; /* it's not a port spec */
		}
	}
	if (cp) { /* points to ":" or "]:" */
		int sz = cp - host + 1;
		host = safe_strncpy(alloca(sz), host, sz);
		if (ENABLE_FEATURE_IPV6 && *cp != ':')
			cp++; /* skip ']' */
		cp++; /* skip ':' */
		port = bb_strtou(cp, NULL, 10);
		if (errno || (unsigned)port > 0xffff) {
			bb_error_msg("bad port spec '%s'", org_host);
			if (ai_flags & DIE_ON_ERROR)
				xfunc_die();
			return NULL;
		}
	}

	memset(&hint, 0 , sizeof(hint));
#if !ENABLE_FEATURE_IPV6
	hint.ai_family = AF_INET; /* do not try to find IPv6 */
#else
	hint.ai_family = af;
#endif
	/* Needed. Or else we will get each address thrice (or more)
	 * for each possible socket type (tcp,udp,raw...): */
	hint.ai_socktype = SOCK_STREAM;
	hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
	rc = getaddrinfo(host, NULL, &hint, &result);
	if (rc || !result) {
		bb_error_msg("bad address '%s'", org_host);
		if (ai_flags & DIE_ON_ERROR)
			xfunc_die();
		goto ret;
	}
	used_res = result;
#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
	while (1) {
		if (used_res->ai_family == AF_INET)
			break;
		used_res = used_res->ai_next;
		if (!used_res) {
			used_res = result;
			break;
		}
	}
#endif
	r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
	r->len = used_res->ai_addrlen;
	memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
	set_nport(r, htons(port));
 ret:
	freeaddrinfo(result);
	return r;
}
#if !ENABLE_FEATURE_IPV6
#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
#endif

#if ENABLE_FEATURE_IPV6
len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
{
	return str2sockaddr(host, port, af, 0);
}

len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
{
	return str2sockaddr(host, port, af, DIE_ON_ERROR);
}
#endif

len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
{
	return str2sockaddr(host, port, AF_UNSPEC, 0);
}

len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
{
	return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
}

len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
{
	return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
}

#undef xsocket_type
int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
{
	SKIP_FEATURE_IPV6(enum { family = AF_INET };)
	len_and_sockaddr *lsa;
	int fd;
	int len;

#if ENABLE_FEATURE_IPV6
	if (family == AF_UNSPEC) {
		fd = socket(AF_INET6, sock_type, 0);
		if (fd >= 0) {
			family = AF_INET6;
			goto done;
		}
		family = AF_INET;
	}
#endif
	fd = xsocket(family, sock_type, 0);
	len = sizeof(struct sockaddr_in);
#if ENABLE_FEATURE_IPV6
	if (family == AF_INET6) {
 done:
		len = sizeof(struct sockaddr_in6);
	}
#endif
	lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
	lsa->len = len;
	lsa->u.sa.sa_family = family;
	*lsap = lsa;
	return fd;
}

int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
{
	return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
}

static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
{
	int fd;
	len_and_sockaddr *lsa;

	if (bindaddr && bindaddr[0]) {
		lsa = xdotted2sockaddr(bindaddr, port);
		/* user specified bind addr dictates family */
		fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
	} else {
		fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
		set_nport(lsa, htons(port));
	}
	setsockopt_reuseaddr(fd);
	xbind(fd, &lsa->u.sa, lsa->len);
	free(lsa);
	return fd;
}

int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
{
	return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
}

int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
{
	return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
}


int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
{
	int fd;
	len_and_sockaddr *lsa;

	lsa = xhost2sockaddr(peer, port);
	fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
	setsockopt_reuseaddr(fd);
	xconnect(fd, &lsa->u.sa, lsa->len);
	free(lsa);
	return fd;
}

int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
{
	int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
	xconnect(fd, &lsa->u.sa, lsa->len);
	return fd;
}

/* We hijack this constant to mean something else */
/* It doesn't hurt because we will add this bit anyway */
#define IGNORE_PORT NI_NUMERICSERV
static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
{
	char host[128];
	char serv[16];
	int rc;
	socklen_t salen;

	salen = LSA_SIZEOF_SA;
#if ENABLE_FEATURE_IPV6
	if (sa->sa_family == AF_INET)
		salen = sizeof(struct sockaddr_in);
	if (sa->sa_family == AF_INET6)
		salen = sizeof(struct sockaddr_in6);
#endif
	rc = getnameinfo(sa, salen,
			host, sizeof(host),
	/* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
			serv, sizeof(serv),
			/* do not resolve port# into service _name_ */
			flags | NI_NUMERICSERV
	);
	if (rc)
		return NULL;
	if (flags & IGNORE_PORT)
		return xstrdup(host);
#if ENABLE_FEATURE_IPV6
	if (sa->sa_family == AF_INET6) {
		if (strchr(host, ':')) /* heh, it's not a resolved hostname */
			return xasprintf("[%s]:%s", host, serv);
		/*return xasprintf("%s:%s", host, serv);*/
		/* - fall through instead */
	}
#endif
	/* For now we don't support anything else, so it has to be INET */
	/*if (sa->sa_family == AF_INET)*/
		return xasprintf("%s:%s", host, serv);
	/*return xstrdup(host);*/
}

char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
{
	return sockaddr2str(sa, 0);
}

char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
{
	return sockaddr2str(sa, IGNORE_PORT);
}

char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
{
	return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
}
char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
{
	return sockaddr2str(sa, NI_NUMERICHOST);
}

char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
{
	return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* Utility routines.
4			*
5			* Connect to host at port using address resolution from getaddrinfo
6			*
7			*/
8
9			#include <netinet/in.h>
10	niro	816	#include <net/if.h>
11	niro	532	#include "libbb.h"
12
13	niro	816	void FAST_FUNC setsockopt_reuseaddr(int fd)
14	niro	532	{
15	niro	816	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
16	niro	532	}
17	niro	816	int FAST_FUNC setsockopt_broadcast(int fd)
18	niro	532	{
19	niro	816	return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
20	niro	532	}
21	niro	816	int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
22			{
23			int r;
24			struct ifreq ifr;
25			strncpy(ifr.ifr_name, iface, IFNAMSIZ);
26			/* Actually, ifr_name is at offset 0, and in practice
27			* just giving char[IFNAMSIZ] instead of struct ifreq works too.
28			* But just in case it's not true on some obscure arch... */
29			r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
30			if (r)
31			bb_perror_msg("can't bind to interface %s", iface);
32			return r;
33			}
34	niro	532
35	niro	816
36			void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
37	niro	532	{
38			if (connect(s, s_addr, addrlen) < 0) {
39			if (ENABLE_FEATURE_CLEAN_UP)
40			close(s);
41			if (s_addr->sa_family == AF_INET)
42			bb_perror_msg_and_die("%s (%s)",
43			"cannot connect to remote host",
44			inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
45			bb_perror_msg_and_die("cannot connect to remote host");
46			}
47			}
48
49			/* Return port number for a service.
50			* If "port" is a number use it as the port.
51			* If "port" is a name it is looked up in /etc/services, if it isnt found return
52			* default_port */
53	niro	816	unsigned FAST_FUNC bb_lookup_port(const char port, const char protocol, unsigned default_port)
54	niro	532	{
55			unsigned port_nr = default_port;
56			if (port) {
57			int old_errno;
58
59			/* Since this is a lib function, we're not allowed to reset errno to 0.
60			* Doing so could break an app that is deferring checking of errno. */
61			old_errno = errno;
62			port_nr = bb_strtou(port, NULL, 10);
63			if (errno \|\| port_nr > 65535) {
64			struct servent *tserv = getservbyname(port, protocol);
65			port_nr = default_port;
66			if (tserv)
67			port_nr = ntohs(tserv->s_port);
68			}
69			errno = old_errno;
70			}
71			return (uint16_t)port_nr;
72			}
73
74
75			/* "Old" networking API - only IPv4 */
76
77	niro	816	/*
78			void FAST_FUNC bb_lookup_host(struct sockaddr_in s_in, const char host)
79	niro	532	{
80			struct hostent *he;
81
82			memset(s_in, 0, sizeof(struct sockaddr_in));
83			s_in->sin_family = AF_INET;
84			he = xgethostbyname(host);
85			memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
86			}
87
88	niro	816
89			int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
90	niro	532	{
91			int s = xsocket(AF_INET, SOCK_STREAM, 0);
92			xconnect(s, (struct sockaddr) s_addr, sizeof(s_addr));
93			return s;
94			}
95	niro	816	*/
96	niro	532
97			/* "New" networking API */
98
99
100	niro	816	int FAST_FUNC get_nport(const struct sockaddr *sa)
101	niro	532	{
102			#if ENABLE_FEATURE_IPV6
103	niro	816	if (sa->sa_family == AF_INET6) {
104			return ((struct sockaddr_in6*)sa)->sin6_port;
105	niro	532	}
106			#endif
107	niro	816	if (sa->sa_family == AF_INET) {
108			return ((struct sockaddr_in*)sa)->sin_port;
109	niro	532	}
110	niro	816	/* What? UNIX socket? IPX?? :) */
111	niro	532	return -1;
112			}
113
114	niro	816	void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
115	niro	532	{
116			#if ENABLE_FEATURE_IPV6
117	niro	816	if (lsa->u.sa.sa_family == AF_INET6) {
118			lsa->u.sin6.sin6_port = port;
119	niro	532	return;
120			}
121			#endif
122	niro	816	if (lsa->u.sa.sa_family == AF_INET) {
123			lsa->u.sin.sin_port = port;
124	niro	532	return;
125			}
126			/* What? UNIX socket? IPX?? :) */
127			}
128
129	niro	816	/* We hijack this constant to mean something else */
130			/* It doesn't hurt because we will remove this bit anyway */
131			#define DIE_ON_ERROR AI_CANONNAME
132
133			/* host: "1.2.3.4[:port]", "www.google.com[:port]"
134			* port: if neither of above specifies port # */
135			static len_and_sockaddr* str2sockaddr(
136			const char *host, int port,
137			USE_FEATURE_IPV6(sa_family_t af,)
138			int ai_flags)
139	niro	532	{
140			int rc;
141	niro	816	len_and_sockaddr *r = NULL;
142	niro	532	struct addrinfo *result = NULL;
143	niro	816	struct addrinfo *used_res;
144	niro	532	const char org_host = host; / only for error msg */
145			const char *cp;
146			struct addrinfo hint;
147
148			/* Ugly parsing of host:addr */
149			if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
150	niro	816	/* Even uglier parsing of [xx]:nn */
151	niro	532	host++;
152			cp = strchr(host, ']');
153	niro	816	if (!cp \|\| cp[1] != ':') { /* Malformed: must have [xx]:nn */
154			bb_error_msg("bad address '%s'", org_host);
155			if (ai_flags & DIE_ON_ERROR)
156			xfunc_die();
157			return NULL;
158			}
159	niro	532	} else {
160			cp = strrchr(host, ':');
161			if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
162			/* There is more than one ':' (e.g. "::1") */
163			cp = NULL; /* it's not a port spec */
164			}
165			}
166	niro	816	if (cp) { /* points to ":" or "]:" */
167	niro	532	int sz = cp - host + 1;
168			host = safe_strncpy(alloca(sz), host, sz);
169			if (ENABLE_FEATURE_IPV6 && *cp != ':')
170			cp++; /* skip ']' */
171			cp++; /* skip ':' */
172	niro	816	port = bb_strtou(cp, NULL, 10);
173			if (errno \|\| (unsigned)port > 0xffff) {
174			bb_error_msg("bad port spec '%s'", org_host);
175			if (ai_flags & DIE_ON_ERROR)
176			xfunc_die();
177			return NULL;
178			}
179	niro	532	}
180
181			memset(&hint, 0 , sizeof(hint));
182			#if !ENABLE_FEATURE_IPV6
183			hint.ai_family = AF_INET; /* do not try to find IPv6 */
184	niro	816	#else
185			hint.ai_family = af;
186	niro	532	#endif
187			/* Needed. Or else we will get each address thrice (or more)
188			* for each possible socket type (tcp,udp,raw...): */
189			hint.ai_socktype = SOCK_STREAM;
190	niro	816	hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
191	niro	532	rc = getaddrinfo(host, NULL, &hint, &result);
192	niro	816	if (rc \|\| !result) {
193			bb_error_msg("bad address '%s'", org_host);
194			if (ai_flags & DIE_ON_ERROR)
195			xfunc_die();
196			goto ret;
197			}
198			used_res = result;
199			#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
200			while (1) {
201			if (used_res->ai_family == AF_INET)
202			break;
203			used_res = used_res->ai_next;
204			if (!used_res) {
205			used_res = result;
206			break;
207			}
208			}
209			#endif
210			r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
211			r->len = used_res->ai_addrlen;
212			memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
213	niro	532	set_nport(r, htons(port));
214	niro	816	ret:
215	niro	532	freeaddrinfo(result);
216			return r;
217			}
218	niro	816	#if !ENABLE_FEATURE_IPV6
219			#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
220			#endif
221	niro	532
222	niro	816	#if ENABLE_FEATURE_IPV6
223			len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
224	niro	532	{
225	niro	816	return str2sockaddr(host, port, af, 0);
226	niro	532	}
227
228	niro	816	len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
229	niro	532	{
230	niro	816	return str2sockaddr(host, port, af, DIE_ON_ERROR);
231	niro	532	}
232	niro	816	#endif
233	niro	532
234	niro	816	len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
235	niro	532	{
236	niro	816	return str2sockaddr(host, port, AF_UNSPEC, 0);
237			}
238
239			len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
240			{
241			return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
242			}
243
244			len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
245			{
246			return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST \| DIE_ON_ERROR);
247			}
248
249			#undef xsocket_type
250			int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
251			{
252			SKIP_FEATURE_IPV6(enum { family = AF_INET };)
253	niro	532	len_and_sockaddr *lsa;
254			int fd;
255	niro	816	int len;
256	niro	532
257			#if ENABLE_FEATURE_IPV6
258	niro	816	if (family == AF_UNSPEC) {
259			fd = socket(AF_INET6, sock_type, 0);
260			if (fd >= 0) {
261			family = AF_INET6;
262			goto done;
263			}
264			family = AF_INET;
265			}
266			#endif
267			fd = xsocket(family, sock_type, 0);
268			len = sizeof(struct sockaddr_in);
269			#if ENABLE_FEATURE_IPV6
270			if (family == AF_INET6) {
271			done:
272	niro	532	len = sizeof(struct sockaddr_in6);
273	niro	816	}
274	niro	532	#endif
275	niro	816	lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
276	niro	532	lsa->len = len;
277	niro	816	lsa->u.sa.sa_family = family;
278	niro	532	*lsap = lsa;
279			return fd;
280			}
281
282	niro	816	int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
283	niro	532	{
284	niro	816	return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
285			}
286
287			static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
288			{
289	niro	532	int fd;
290			len_and_sockaddr *lsa;
291
292			if (bindaddr && bindaddr[0]) {
293	niro	816	lsa = xdotted2sockaddr(bindaddr, port);
294	niro	532	/* user specified bind addr dictates family */
295	niro	816	fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
296	niro	532	} else {
297	niro	816	fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
298	niro	532	set_nport(lsa, htons(port));
299			}
300			setsockopt_reuseaddr(fd);
301	niro	816	xbind(fd, &lsa->u.sa, lsa->len);
302	niro	532	free(lsa);
303			return fd;
304			}
305
306	niro	816	int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
307	niro	532	{
308	niro	816	return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
309			}
310
311			int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
312			{
313			return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
314			}
315
316
317			int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
318			{
319	niro	532	int fd;
320			len_and_sockaddr *lsa;
321
322	niro	816	lsa = xhost2sockaddr(peer, port);
323			fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
324	niro	532	setsockopt_reuseaddr(fd);
325	niro	816	xconnect(fd, &lsa->u.sa, lsa->len);
326	niro	532	free(lsa);
327			return fd;
328			}
329
330	niro	816	int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
331	niro	532	{
332	niro	816	int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
333			xconnect(fd, &lsa->u.sa, lsa->len);
334	niro	532	return fd;
335			}
336
337	niro	816	/* We hijack this constant to mean something else */
338			/* It doesn't hurt because we will add this bit anyway */
339			#define IGNORE_PORT NI_NUMERICSERV
340			static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
341	niro	532	{
342			char host[128];
343			char serv[16];
344	niro	816	int rc;
345			socklen_t salen;
346
347			salen = LSA_SIZEOF_SA;
348			#if ENABLE_FEATURE_IPV6
349			if (sa->sa_family == AF_INET)
350			salen = sizeof(struct sockaddr_in);
351			if (sa->sa_family == AF_INET6)
352			salen = sizeof(struct sockaddr_in6);
353			#endif
354			rc = getnameinfo(sa, salen,
355	niro	532	host, sizeof(host),
356	niro	816	/* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
357	niro	532	serv, sizeof(serv),
358	niro	816	/* do not resolve port# into service _name_ */
359			flags \| NI_NUMERICSERV
360	niro	532	);
361	niro	816	if (rc)
362			return NULL;
363			if (flags & IGNORE_PORT)
364			return xstrdup(host);
365			#if ENABLE_FEATURE_IPV6
366			if (sa->sa_family == AF_INET6) {
367			if (strchr(host, ':')) /* heh, it's not a resolved hostname */
368			return xasprintf("[%s]:%s", host, serv);
369			/return xasprintf("%s:%s", host, serv);/
370			/* - fall through instead */
371			}
372			#endif
373			/* For now we don't support anything else, so it has to be INET */
374			/if (sa->sa_family == AF_INET)/
375			return xasprintf("%s:%s", host, serv);
376			/return xstrdup(host);/
377	niro	532	}
378
379	niro	816	char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
380	niro	532	{
381	niro	816	return sockaddr2str(sa, 0);
382	niro	532	}
383
384	niro	816	char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
385	niro	532	{
386	niro	816	return sockaddr2str(sa, IGNORE_PORT);
387	niro	532	}
388	niro	816
389			char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
390			{
391			return sockaddr2str(sa, NI_NAMEREQD \| IGNORE_PORT);
392			}
393			char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
394			{
395			return sockaddr2str(sa, NI_NUMERICHOST);
396			}
397
398			char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
399			{
400			return sockaddr2str(sa, NI_NUMERICHOST \| IGNORE_PORT);
401			}